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MCQs

Total Questions : 222 | Page 21 of 23 pages
Question 201. Which of the following D.C. distribution system is the simplest and lowest in first cost?
  1.    None of these
  2.    Interconnected system
  3.    Radial system
  4.    Ring system
 Discuss Question
Answer: Option C. -> Radial system
Question 202. For transmission of power over a distance of 500 km, the transmission voltage should be in the range
  1.    100 to 120 kV
  2.    60 to 100 kV
  3.    150 to 220 kV
  4.    20 to 50 kV
 Discuss Question
Answer: Option C. -> 150 to 220 kV
Question 203. The skin effect of a conductor will reduce as the
  1.    Frequency increases
  2.    Diameter increases
  3.    Resistivity of conductor material increases
  4.    Permeability of conductor material increases
 Discuss Question
Answer: Option C. -> Resistivity of conductor material increases
Question 204. The spacing between phase conductors of a 220 kV line is approximately equal to
  1.    2 m
  2.    3.5 m
  3.    6 m
  4.    8.5 m
 Discuss Question
Answer: Option C. -> 6 m
Question 205. The following system is not generally used
  1.    1-phase 3-wire
  2.    1-phase 4-wire
  3.    3-phase 4-wire
  4.    3-phase 3-wire
 Discuss Question
Answer: Option A. -> 1-phase 3-wire
Question 206. The cause of damage to the lead sheath of a cable is
  1.    mechanical damage
  2.    chemical action on the lead when buried in the earth
  3.    all of these
  4.    crystallisation of the lead through vibration
 Discuss Question
Answer: Option C. -> all of these
Question 207. Electromechanical voltage regulators are generally used in
  1.    Generators
  2.    Transformers
  3.    Reactors
  4.    All of these
 Discuss Question
Answer: Option A. -> Generators
Question 208. Which of the following is the demerit of a 'constant voltage transmission system'?
  1.    Possibility of better protection for the line due to possible use of higher terminal reactants
  2.    Availability of steady voltage at all loads at the line terminals
  3.    Improvement of power factor at times of moderate and heavy loads
  4.    Increase of short-circuit current of the system
 Discuss Question
Answer: Option D. -> Increase of short-circuit current of the system
Question 209. A conductor, due to sag between two supports, takes the form of
  1.    Triangle
  2.    Catenary
  3.    Ellipse
  4.    Semicircle
 Discuss Question
Answer: Option B. -> Catenary
Question 210. A feeder, in a transmission system, feeds power to
  1.    Distributors
  2.    All of these
  3.    Generating stations
  4.    Service mains
 Discuss Question
Answer: Option A. -> Distributors

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